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git fetch and git pull both download changes from a remote repository, but only one updates your current branch. This guide explains the difference, when to use each command, and how to avoid merge surprises.

How to use sha256sum and md5sum to generate and verify checksums for files, validate ISO downloads, and detect tampering on Linux systems.

Quick reference for connecting to PostgreSQL, managing databases and roles, granting privileges, and running backup commands.

Step-by-step instructions for creating PostgreSQL users (roles), setting passwords, and granting or revoking privileges on databases, schemas, and tables.

How to use git cherry-pick to apply commits from one branch to another, including single commits, ranges, conflict handling, backports, and merge commits.

Reference for the ufw command on Linux, with examples for enabling the firewall, allowing and denying traffic, deleting rules, and managing application profiles.

Quick reference for the du command: check directory sizes, human-readable output, depth limits, sorting by size, exclusions, and apparent size.

Quick reference for querying DNS records and checking name resolution with nslookup ...

The nslookup command queries DNS servers for domain records. This guide covers A, MX, NS, TXT, and AAAA lookups, reverse DNS, interactive mode, and choosing a specific name server.

Side-by-side comparison of Debian and Ubuntu Server covering release cycles, package freshness, security, cloud support, and ease of setup to help you pick the right one.